MECHANICAL PROPERTIES OF LIME-STABILIZED SOIL SUBJECTED TO NORMAL AND OVER-CONSOLIDATION HISTORIES

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  • 正規・過圧密履歴を受けた石灰安定処理土の養生初期における力学特性

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 In this paper, in order to clarify the mechanical properties of lime-stabilized soil subjected to normal and over-consolidation histories, a series of laboratory tests at different mixture ratio of lime-stabilizer were carried out. The experiments involve isotropic consolidation test and consolidated undrained compression (CU) test. The following conclusions are obtained from this study: (1) Even if the lime-stabilized soil is in early curing period, its compressibility and swelling can be suppressed. 2) The shear strength of the stabilized soil increases according to the increase of mixture rate of lime-stabilizer. Its improvement effect of the soil appears remarkably in over-consolidation ratio. 3) During shear process, the lime- stabilized soil subjected to heavily over-consolidation histories is shown positive dilatancy and the soil subjected to normal-consolidation histories is exhibited negative dilatancy. Frictional resistance of soil particles of the lime-stabilized soil at the critical state becomes large gradually by increasing mixture ratio of lime-stabilizer. (4) The internal friction angle φ′ of lime-stabilized soil is not much affected by the amount of lime-stabilizer, and is within the range of 30 to 32 degree. In contrast, mixing much lime-stabilizer with soil, the apparent cohesion c′ increases higher.

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